****spring boot-----restTemplate

封装了HttpURLConnection,HttpClient,Netty等接口访问实现库

restTemplet包含以下部分

HttpMessageConverter ClientHttpRequestFactory -->HttpURLConnection ResponseErrorHandler ClientHttpRequestInterceptor

部分实例代码

（1）发送GET请求（getForObject()、getForEntity()、exchange()）

// 1-getForObject()

User user1 = this.restTemplate.getForObject(uri, User.class);

// 2-getForEntity()

ResponseEntity responseEntity1 = this.restTemplate.getForEntity(uri, User.class);

HttpStatus statusCode = responseEntity1.getStatusCode();

HttpHeaders header = responseEntity1.getHeaders();

User user2 = responseEntity1.getBody();

// 3-exchange()

RequestEntity requestEntity = RequestEntity.get(new URI(uri)).build();

ResponseEntity responseEntity2 = this.restTemplate.exchange(requestEntity, User.class);

User user3 = responseEntity2.getBody();

（2）发送POST请求（postForObject()、postForEntity()、exchange()）

// 1-postForObject()

User user1 = this.restTemplate.postForObject(uri, user, User.class);

// 2-postForEntity()

ResponseEntity responseEntity1 = this.restTemplate.postForEntity(uri, user, User.class);

// 3-exchange()

RequestEntity requestEntity = RequestEntity.post(new URI(uri)).body(user);

ResponseEntity responseEntity2 = this.restTemplate.exchange(requestEntity, User.class);

（3）设置HTTP Header信息

//1-postForObject()

User user1 = this.restTemplate.postForObject(uri, user, User.class);

// 2-postForEntity()

ResponseEntity responseEntity1 = this.restTemplate.postForEntity(uri, user, User.class);

// 3-exchange()

RequestEntity requestEntity = RequestEntity.post(new URI(uri)).body(user);

ResponseEntity responseEntity2 = this.restTemplate.exchange(requestEntity, User.class);

（4）设置HTTP Header信息 ##

@Configuration

public class RestClientConfig {

@Bean

public ClientHttpRequestFactory httpRequestFactory() {

return new HttpComponentsClientHttpRequestFactory(httpClient());

}

@Bean

public RestTemplate restTemplate() {

return new RestTemplate(httpRequestFactory());

}

@Bean

public HttpClient httpClient() {

Registry registry = RegistryBuilder. create()

.register("http", PlainConnectionSocketFactory.getSocketFactory())

.register("https", SSLConnectionSocketFactory.getSocketFactory())

.build();

PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager(registry);

connectionManager.setMaxTotal(5);

connectionManager.setDefaultMaxPerRoute(5);

RequestConfig requestConfig = RequestConfig.custom()

.setSocketTimeout(8000)

.setConnectTimeout(8000)

.setConnectionRequestTimeout(8000)

.build();

return HttpClientBuilder.create()

.setDefaultRequestConfig(requestConfig)

.setConnectionManager(connectionManager)

.build();

}

}